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CEL: Codes P0300, P0301, P0302, P0303, P0304, P0306

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Old 12-05-10, 07:04 PM   #1
sktn77a
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Default CEL: Codes P0300, P0301, P0302, P0303, P0304, P0306

Hi all:

Our 1999 RX300 (we've had it since new) is idling and driving a little rough (not as bad as a typical bad coil misfire). The code reader is putting out codes P0300, P0301, P0302, P0303, P0304, P0306. We had 1 coil replaced about 18 months ago so that might explain why we're only getting 5/6 cylinder misfire codes(?) But I can't believe that all 5 coils would go out at once.

EDIT: I checked the service records and it was cylinder 5 coil that was replaced!

Any other ideas that could cause a general misfire code reading?

Thanks
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1999 Lexus RX300 AWD

Last edited by sktn77a; 12-05-10 at 07:32 PM..
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Old 12-05-10, 11:47 PM   #2
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Quote:
Originally Posted by sktn77a View Post
Hi all:

Our 1999 RX300 (we've had it since new) is idling and driving a little rough (not as bad as a typical bad coil misfire). The code reader is putting out codes P0300, P0301, P0302, P0303, P0304, P0306. We had 1 coil replaced about 18 months ago so that might explain why we're only getting 5/6 cylinder misfire codes(?) But I can't believe that all 5 coils would go out at once.

EDIT: I checked the service records and it was cylinder 5 coil that was replaced!

Any other ideas that could cause a general misfire code reading?

Thanks
Without exception, I always cancel the TC's and see what comes up 1st. I can't even imagine it showing 5 legitimate misfires, or bad coils. I don't know why it some times spills it's guts 1st. time around, but common sense says disregard and see what comes up 1st. on the second go-around. A million to one it won't be the same.
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Old 12-06-10, 04:52 AM   #3
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Tried it; got the same codes after re-setting last night and again this morning:

UIF
01
02
03
P0300
P0301
P0302
P0303
P0304
P0306

I believe the first 4 are unique to my reader.

Guess it's a trip to the stealer!

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Old 12-06-10, 12:44 PM   #4
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Well, It was the coil on #4 cyliner - is that at the back or the front?

$300. I guess it could have been worse.
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Old 12-06-10, 12:44 PM
 
 
 
 
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0300, 1999, 2002, 300, 530i, bmw, code, lexus, p0300, p0301, p0302, p0303, p300, rx, rx300

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